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Commit 5b5052e3 authored by Sekhar Nori's avatar Sekhar Nori Committed by Kevin Hilman
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davinci: explain CLOCK_TICK_RATE of 27MHz in include/mach/timex.h 



Leave a comment explaining the constant value of 27Mhz used
in include/mach/timex.h for all DaVinci platforms. Many of
the platforms actually run at 24MHz timer frequency (Eg.
EVMs of DM355, DM365 and OMAP-L1).

The comment also serves as a porting alert.

Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent 60cd02e1

arch/arm/mach-davinci/include/mach/timex.h

+6 −1
Original line number Diff line number Diff line
@@ -11,7 +11,12 @@ 
#ifndef __ASM_ARCH_TIMEX_H

#define __ASM_ARCH_TIMEX_H



/* The source frequency for the timers is the 27MHz clock */

/*

 * Alert: Not all timers of the DaVinci family run at a frequency of 27MHz,

 * but we should be fine as long as CLOCK_TICK_RATE or LATCH (see include/

 * linux/jiffies.h) are not used directly in code. Currently none of the

 * code relevant to DaVinci platform depends on these values directly.

 */

#define CLOCK_TICK_RATE 27000000



#endif /* __ASM_ARCH_TIMEX_H__ */